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换填与降排水措施对寒区沟谷软弱路基冻结特征的影响

武立波 牛富俊 林战举 祁伟 冯文杰

武立波, 牛富俊, 林战举, 祁伟, 冯文杰. 换填与降排水措施对寒区沟谷软弱路基冻结特征的影响[J]. 交通运输工程学报, 2018, 18(4): 22-33. doi: 10.19818/j.cnki.1671-1637.2018.04.003
引用本文: 武立波, 牛富俊, 林战举, 祁伟, 冯文杰. 换填与降排水措施对寒区沟谷软弱路基冻结特征的影响[J]. 交通运输工程学报, 2018, 18(4): 22-33. doi: 10.19818/j.cnki.1671-1637.2018.04.003
WU Li-bo, NIU Fu-jun, LIN Zhan-ju, QI Wei, FENG Wen-jie. Effect of replacing-filling and dewatering-draining measures on frozen characteristics of weak subgrade in cold valley region[J]. Journal of Traffic and Transportation Engineering, 2018, 18(4): 22-33. doi: 10.19818/j.cnki.1671-1637.2018.04.003
Citation: WU Li-bo, NIU Fu-jun, LIN Zhan-ju, QI Wei, FENG Wen-jie. Effect of replacing-filling and dewatering-draining measures on frozen characteristics of weak subgrade in cold valley region[J]. Journal of Traffic and Transportation Engineering, 2018, 18(4): 22-33. doi: 10.19818/j.cnki.1671-1637.2018.04.003

换填与降排水措施对寒区沟谷软弱路基冻结特征的影响

doi: 10.19818/j.cnki.1671-1637.2018.04.003
基金项目: 

中国科学院科技服务网络计划项目 KFJ-STS-ZDTP-037

国家科技支撑计划项目 2014BAG05B05

甘肃省交通运输厅科研项目 2012-09

详细信息
    作者简介:

    武立波(1978-), 女, 宁夏青铜峡人, 宁夏大学副教授, 中国科学院西北生态环境资源研究院工学博士研究生, 从事寒区公路冻害研究

    牛富俊(1970-), 男, 甘肃会宁人, 中国科学院西北生态环境资源研究院研究员, 工学博士

  • 中图分类号: U416.168

Effect of replacing-filling and dewatering-draining measures on frozen characteristics of weak subgrade in cold valley region

More Information
  • 摘要: 基于甘肃南部宕昌-迭部二级公路, 选取了2个典型寒区沟谷软土路基试验段, 监测了2个冻融期内路基温度、含水量、变形以及地下水位, 分析了弃渣换填深度与降排水措施对路基冻结特征的影响。分析结果表明: 在监测的2个冻结期内, 换填深度为2.0m的试验段K18+180的冻结深度比换填深度为1.0m的试验段K18+330的冻结深度大0.12~0.16m, 说明换填深度越大, 冻结深度越大; K18+330段初始地下水位为3.4m, 仅设置地表排水沟时, 冻结期间地下水位稳定在3.4m左右, 距冻结面的最小距离为1.7m, 说明设置排水沟时地下水位在冻结期间基本没有变化; K18+180段初始地下水位是1.3m, 在设置了渗沟降水措施后, 冻结期间地下水位稳定在2.0m左右, 距冻结面的最小距离为0.2m, 地下水位降低了约0.7m, 因此, 渗沟降水可以降低地下水位, 防止路基冻胀; K18+180段路基中心2个周期监测的最大冻胀分别为3.4、4.2mm, 而K18+330段相应位置的最大冻胀分别为10.7、14.0mm, 后者均是前者的3倍多, 说明换填深度越大路基冻胀越小; 《公路路基设计规范》 (JTG D30—2015) 规定的二级公路容许冻胀为50mm, 软土路基容许工后沉降为500mm, K18+180、K18+330段路基的最大沉降分别为1.5、1.8mm, 最大冻胀分别为4.2、14.0mm, 远远小于规范值, 表明试验段路基的稳定性良好, 采用换填与降排水措施能有效控制路基冻胀。

     

  • 图  1  宕昌-迭部公路位置

    Figure  1.  Location of Tanchang-Diebu Highway

    图  2  试验场地的土层分布

    Figure  2.  Soil layers distribution in test site

    图  3  试验场地的原路况

    Figure  3.  Original road conditions in test site

    图  4  隧道弃渣碎石土

    Figure  4.  Tunnel muck gravel soil

    图  5  隧道弃渣碎石土的颗粒级配曲线

    Figure  5.  Grading curve of tunnel muck gravel soil

    图  6  监测钻孔布设

    Figure  6.  Monitoring boreholes arrangement

    图  7  K18+180段路基断面和监测孔

    Figure  7.  Cross-section and monitoring boreholes at section K18+180

    图  8  地温分布(单位: ℃)

    Figure  8.  Ground temperature distributions (unit: ℃)

    图  9  路基土含水率

    Figure  9.  Water contents of subgrade soils

    图  10  地下水位

    Figure  10.  Groundwater levels

    图  11  路基变形

    Figure  11.  Subgrade deformations

    图  12  路基中心冻结-融解期变形与冻结/融化深度

    Figure  12.  Deformations and freezing/thawing depths in freezing-thawing period at subgrade centers

    图  13  路基中心冻深与冻胀量

    Figure  13.  Frost depth and frost heaving amount at subgrade centers

    图  14  路基冻深与地下水位

    Figure  14.  Frost depths and groundwater levels of subgrades

    表  1  试验场地气候条件

    Table  1.   Climate conditions of test site

    下载: 导出CSV

    表  2  粉质黏土层的物理指标

    Table  2.   Physical indexes of silty-clay layers

    下载: 导出CSV

    表  3  软土路基处理措施

    Table  3.   Protective measures of soft soil subgrade

    下载: 导出CSV

    表  4  不同位置的最大冻深

    Table  4.   Maximum frost depths at different locations

    下载: 导出CSV
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  • 收稿日期:  2018-04-21
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